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Commit 2806e6ad authored by Wolfram Sang's avatar Wolfram Sang Committed by Wolfram Sang
Browse files

i2c: send STOP after successful bus recovery 



If we managed to get a client release SDA again, send a STOP afterwards
to make sure we have a consistent state on the bus again.

Tested-by: default avatarPhil Reid <preid@electromag.com.au>
Signed-off-by: default avatarWolfram Sang <wsa+renesas@sang-engineering.com>
Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
parent 72b08fcc

drivers/i2c/i2c-core-base.c

+12 −0
Original line number Diff line number Diff line
@@ -199,6 +199,18 @@ int i2c_generic_scl_recovery(struct i2c_adapter *adap) 
	if (bri->get_sda && !bri->get_sda(adap))

		ret = -EBUSY;



	/* If all went well, send STOP for a sane bus state. */

	if (ret == 0 && bri->set_sda) {

		bri->set_scl(adap, 0);

		ndelay(RECOVERY_NDELAY / 2);

		bri->set_sda(adap, 0);

		ndelay(RECOVERY_NDELAY / 2);

		bri->set_scl(adap, 1);

		ndelay(RECOVERY_NDELAY / 2);

		bri->set_sda(adap, 1);

		ndelay(RECOVERY_NDELAY / 2);

	}



	if (bri->unprepare_recovery)

		bri->unprepare_recovery(adap);